Overview of ongoing infrasound research at the Georgia Institute of Technology

Abstract

This presentation discusses ongoing research in Infrasound technologies at the Georgia Institute of Technology, Georgia Tech Research Institute (GTRI), the applied research arm of the Georgia Tech. In particular, results of a study that compared a number of commercially available infrasound sensors with several windscreen technologies are presented. Among them, comparisons obtained with a wind screen loaned to GTRI by NASA Langley and described by Ahuja and Shams in the 2017 Infrasound Workshop are also presented. Sources producing controlled infrasound under study at GTRI are also discussed. These include a sonic boom simulator, a propane vapor burner, oscillating jets, a nitrogen cannon and a low frequency acoustic driver. In addition, signatures from people moving through doorways are also presented. Each source was most effective in a given frequency range. Controlled infrasound at 0.1 Hz was obtained by several sources, among which a flame and a cold plume modulated at nominal frequencies of 0.1 Hz. Moreover, preliminary results of successful attempts at characterizing the infrasound sources and removing wind noise via wavelet analysis are also presented.